Should be possible to load view content using a custom method

[finnsson]

In order to facilitate programming in the large it is useful to be able to extract views as separate components.
These views should not be forced to be stored as html-fragments or be loaded with jQuery.

Thus a way to inject custom views should be possible. This is done using the source- or
sourceOnShow-properties. Just supply a method instead of a string!

These properties takes a method that should take a pager.Page as first argument, a callback, and return nothing.

<div data-bind="page: {id: 'zoidberg', sourceOnShow: requireView('character/zoidberg')}" />

where

window.requireView = function(viewModule) {
  return function(page, callback) {
    require([viewModule], function(viewString) {
      $(page.element).html(viewString);
      callback();
    });
  };
};

if

// file: character/zoidberg.js
define(function() {
  return '<h1>Zoidberg</h1>';
});